I'm so tired 
My DS is almost 18 months and has slept though the night twice.
I feel like we've tried everything and I don't know what to do anymore.
We have a set routine, tea time, half an hour playing, bath, story and a cuddle then bed. He'll go down and sleep for about an hour then wakes up and screams the house down.
He'll eventually settle again after about an hour and sleep till we go to bed about 11.30/12 ish
As soon as I start to drift off to sleep the screaming starts again.
He will not settle with DH and the screaming gets so bad I can't stay away so we're all up.
I did try crying it out but found it so difficult, one I couldn't handle the sound and two our house is practically made from cardboard and I'm paranoid about pissing the neighbours off.
I've tried picking him up and putting him back down again, he just stands in his cot and screams with rage.
Tried sitting in his room until he falls asleep but the sleep never came, after three hours I still had a screaming tantrum going on.
DH bought a fancy nightlight that puts stars on the ceiling but has had zero impact.
DS is now starting to scream if we even take him into his bedroom.
I've made a terrible mistake and started taking DS into bed with us when he wakes round midnight. DH and I both work full time and were exhausted so took the easy cop out - it's made things so much worse.
I'm now worried that this broken sleep could have a negative effect on DS development as he's not speaking as much as I'd expect for his age.
Can anyone suggest where I'm going wrong?
It's also resulting in practically zero sex life which isn't great fun either.
Can anyone offer any pearls of wisdom?